350-601 Network Practice Question
Which command displays the VLANs allowed on a trunk interface?
⚠ Common exam trap
Test-takers frequently confuse 'show interface switchport' (which shows trunking status and native VLAN) with 'show interface trunk' (which shows the allowed VLAN list), leading them to choose option C instead of D.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
show interface trunk
The 'show interface trunk' command displays trunk parameters, including the VLANs allowed on the trunk interface. This command shows the trunking mode, encapsulation (e.g., 802.1Q), and the allowed VLAN list for each trunk port. It is the direct command to verify which VLANs are permitted on a specific trunk link.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
show running-config interface
Why it's wrong here
It shows configuration but is not the quickest way to verify allowed VLANs.
- ✗
show vlan
Why it's wrong here
show vlan shows VLAN database, not trunk information.
- ✗
show interface switchport
Why it's wrong here
This shows switchport mode but not allowed VLANs.
- ✓
show interface trunk
Why this is correct
This command directly shows trunk status and allowed VLANs.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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